TWO-DIMENSIONAL MAGNETIC ORDER IN HEXAGONAL LuFe2O4 J. Iida, Y. Nakagawa, S. Funahashi, S. Takekawa et N. Kimizuka J. Phys. Colloques, 49 C8 (1988) C8-1497-C8-1498 DOI: 10.1051/jphyscol:19888689